The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 1997
Filed:
May. 02, 1994
Robert J Walsh, Ashland, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
Postponing the interrupt for an I/O event can increase system throughput by amortizing the cost of the interrupt service routine over multiple I/O events. In current systems that provide interrupt postponement, the time parameter is fixed. Fixed values can lead to parameter configuration errors, excessive characterization work to generate parameter values, and a failure to automatically re-configure to system changes or to external load changes. The proposed mechanism measures actual system experience and eliminates the parameter configuration effort by filtering its own experience to derive a target value for interrupt postponement. A current postponement value with the potentially greater variance than the target is used to rapidly respond to abrupt change in offered load. The invention also benefits tasks with real-time deadlines to provide correct system operation.